Bonds donor-acceptor

The nitrogen atom in ri -pyrrolylmanganesetricarbonyl forms a donor-acceptor bond with transition metals. Complexes in which the pyrrolyl ring behaves as a tt ligand for the manganese atom and n-donor for the other metal were synthesized 12 (M = Mn, Re) [78JOM(157)431]. The binuclear heterobimetallic complexes... 

Let us now examine the consequences of the formation of a donor-acceptor bond in a little more detail. If the donor - acceptor bond is completely covalent, then we record net transfer of one unit of charge from the donor to the acceptor as a direct consequence of the equal sharing of the electron pair between the two centres. This result leaves a positive charge on the donor atom and a negative charge on the acceptor atom. The limiting ionic and covalent descriptions of a complex cation such as [Fe(H20)6] are shown in Fig. 1-1. 

In practice one can differentiate between two kinds of donors, the resulting donor-acceptor bonds can be largely ionic (class I) or covalent (class II) [16]. Donors of the first type (class I) stem from the first row of the periodic table of elements, such as amines, ethers, in detail structures in which the Lewis basis centre possessing the non-bonding lone pair is strong electronegative. Donors of the second type are constituted from elements of the second row of the periodic table of elements, such as phosphines, thioethers, etc. (class II). These Lewis donors are... 

We should note that the formation of this bond confers formal charges on the B and N atoms. In this bond and many similar Lewis acid-base complexes both the electrons forming the bond come from the same atom rather than from different atoms, as in the formation of a bond between two chlorine atoms. This type of bond is often called a donor-acceptor bond, a dative bond, or a coordinate bond, and is sometimes given a special symbol—an arrow denoting the direction in which the electron pair is donated ... 

Gur yanova, E. N., Gol dshtein, I. R, and Romm, I. P. (1975). Donor-Acceptor Bond. Wiley, New York. A translation of a Russian book that contains an enormous amount of information and data on the interactions of many Lewis acids and bases. 

The complex in which olefin is bound by the donor acceptor bond to the oxygen atom of hydroperoxide and exists in the secondary coordination sphere is also considered in the literature [241]. 

Group 13 donor—acceptor bonds involving aluminum 15... 

Cowley, A. H. From group 13-group 13 donor-acceptor bonds to triple-decker cations. Chem. Commun. 2004, 2369-2375. 

The concept of the chain-carriers in the cationic polymerisations has become increasingly sophisticated over the last five decades. The view that the chain-carrier in the polymerisations initiated by, e.g., A1C13 is a carbenium ion (then known as a carbonium ion) evolved around 1940, and by the end of the decade the need to consider the pairing of ions, especially in non-polar solvents, had been generally accepted. The idea that the cations can form donor-acceptor bonds with the monomers originated in 1947, but its full implications were not appreciated until very much later. Because of these developments and for other reasons, the propagation rate-constants of such cationoid polymerisations... 

These results demonstrate that it is difficult to make a general statement about the accuracy of the MP2 or B3LYP approaches vis-a-vis that of CCSD(T). For example, the BDEs of the N-EH3 donor-acceptor bonds (E = B, Al, Ga) are very similar at the MP2/II and B3LYP/II levels of theory. They also agree with the CCSD(T)/II value for the N-BH3 bond. However, for the N-BCI3 and N-BBr3 bonds, the B3LYP/H... 

NH3 and W-NH3 donor-acceptor bonds appear to be more reliable as they agree quite well with the CCSD(T)/II estimates. 

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